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There are two main causes for sludge, not changing the oil and filter at regular times, and not running the engine long enough to get it hot. You might want to get a second opinion from a shop other than the dealer. The dealer may have a sales promotion on engine flushes this month.
the ticking noise could be the rockers and the clearance may need to be checked and possibly adjusted.you should get the oil pressure checked with a gage to make sure its not an oil pressure problem.and start getting your oil changed on a regular basis as this is the most common problem for engine problems and failure and its the cheapest most cost effective maintenance.
The low oil pressure warning lamp will illuminate when the ignition switch is turned to the
position without the engine running. The lamp also illuminates
if the engine oil pressure drops below a safe oil pressure level. To
test the system, perform the following:
Turn the ignition switch to the
If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
If the wire at the connector checks out OK, pull the connector
loose from the switch and, with a jumper wire, ground the connector to
With the ignition switch turned to the
position, check the warning lamp. If the lamp still fails
to light, check for a burned out lamp or disconnected socket in the
REMOVAL & INSTALLATION On the
2.4L engine, the oil pressure switch is located on the side of the
engine block facing the firewall. On the 3.0L engine, the oil pressure
switch is located on the oil filter adapter housing, next to the starter
motor. On the 3.3L and 3.8L engines, the oil pressure switch is located
next to the oil filter.
Locate the oil pressure sending unit on the engine.
Disconnect the negative battery cable.
Disconnect the pressure switch electrical harness.
Using a pressure switch socket, deep-well socket or wrench, loosen and remove the pressure switch from the engine.
Install the pressure switch into the engine and tighten securely.
Attach the electrical connector to the switch.
Connect the negative battery cable.
Start the engine, allow it to reach operating temperature and check for leaks.
Yes there is a sensor located on the front of engine on the transmission side(single wire). It cannot be "reset". Possibly loose connection at the sensor,or a faulty sensor, OR... you could be losing oil pressure inside the engine somewhere(lets hope not) these engines are designed to run on very low oil pressure compared to cars of days gone by. The sonata 4 cylinder runs about only 12 psi. The V6 is 7.6 psi or more.
So if it is an oil pressure issue it is extremely important not to run the car before it is fixed or you will need an entire engine.
On all 2.0L and 2.4L engines, the oil pressure sending unit switch
is located on the engine block, below the exhaust manifold, on the
firewall side. On all 2.5L engines, the oil pressure sending unit
switch is located on the engine block, below the front exhaust manifold
on the radiator side.